I currently own 2 Hondas - an XR650R with street tires for eating up the canyons and a Shadow 1100 Aero for touring. Anyway, a commonly known solution to carbeuration problems among Shadow riders, particularly those on Hondashadow.net, is a product called Dial-A-Jet. It's made by Thunder Products. Here's a URL to the Hondashadow.net forum search page. http://hondashadow.net/forum.php Do a search for dial-a-jet or just "daj" for short. It sounds pretty interesting, and I don't see why it wouldn't work for an XR650R. Dial-A-Jet only costs about $120 or so and supposedly enables you to instantly adjust your jetting situation to compensate for bike mods in addition to changes in elevation. It's also said to smooth out throttle response and actuall INCREASE fuel economy. (Weird.) The Edelbrock Quicksilver carb seems too expensive to me, and Dyno'ing the stock carb ain't cheap either. You can check out Dial-A-Jet by going to Thunder Products' website at: http://www.thunderproducts.com/ If anyone has any thoughts on this idea, please reply.